Create sketch_191029a.pyde

2019/sketch_191029a/sketch_191029a.pyde

@@ -0,0 +1,57 @@
+# Baseado no L-System apresentado pela Tatasz na
+# Noite de Processing hoje!
+
+axiom = "F+G+G"
+sentence = axiom
+stroke_len = 300
+angle = radians(-120)
+
+# rule_a = ("F", "G")
+# rule_b = ("F+GF[-G+]+FF", "GGFG")
+rule_a = ("F",           "G")
+rule_b = ("F+G-F-G++FF", "GFG")
+
+def setup():
+    size (600, 600)
+    background(220, 220, 200)
+    scale(.35)
+    translate(width - 400, height - 400)
+    strokeWeight(2)
+    generate(5)
+    plot()
+
+def generate(n):
+    global stroke_len, sentence
+    for c in range(n):
+        stroke_len *= 0.5
+        nextSentence = ""
+        for c in sentence:
+            found = False
+            for c_a, c_b in zip(rule_a, rule_b):
+                if c == c_a:
+                    found = True
+                    nextSentence += c_b
+                    break
+            if not found:
+                nextSentence += c
+        sentence = nextSentence
+    
+def plot():
+    for c in sentence:
+        if c == "F":
+            stroke(0)
+            line(0, 0, 0, -stroke_len)
+            translate(0, -stroke_len)
+         # ellipse(0, 0, 10, 10)
+        elif c == "G":
+            stroke(0, 0, 255)
+            line(0, 0, 0, -stroke_len)
+            translate(0, -stroke_len)
+        elif c == "+":
+            rotate(angle)
+        elif c == "-":
+            rotate(-angle)
+        elif c == "[":
+            pushMatrix()
+        elif c == "]":
+            popMatrix()